NestedList loading treeGrid JSON data

NestedList loading treeGrid JSON data

Hi, I'm trying to use the nestedList project example issued as an example by bharatnhere (which I have working) .
If you look at the JSON file in that example you will notice that it does not conform to valid JSON syntax (according to http://jsonformatter.curiousconcept.com/) but it works
I am trying to exchange my JSON data to operate within the same simple structure as the example while my JSON does conform, it does not work .

I attach my project including both JSON files (as .txt)
Can someone please help me get this very simple example working?
Cheers